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DOI | 10.1038/s41561-018-0109-5 |
Microbial decomposition of marine dissolved organic matter in cool oceanic crust | |
Walter, Sunita R. Shah1,2,6; Jaekel, Ulrike1,7; Osterholz, Helena3; Fisher, Andrew T.4; Huber, Julie A.5; Pearson, Ann2; Dittmar, Thorsten3; Girguis, Peter R.1 | |
2018-05-01 | |
发表期刊 | NATURE GEOSCIENCE |
ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2018 |
卷号 | 11期号:5页码:334-+ |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Germany; Norway |
英文摘要 | Marine dissolved organic carbon (DOC) is one of the largest active reservoirs of reduced carbon on Earth. In the deep ocean, DOC has been described as biologically recalcitrant and has a radiocarbon age of 4,000 to 6,000 years, which far exceeds the timescale of ocean overturning. However, abiotic removal mechanisms cannot account for the full magnitude of deep-ocean DOC loss. Deep-ocean water circulates at low temperatures through volcanic crust on ridge flanks, but little is known about the associated biogeochemical processes and carbon cycling. Here we present analyses of DOC in fluids from two borehole observatories installed in crustal rocks west of the Mid-Atlantic Ridge, and show that deep-ocean DOC is removed from these cool circulating fluids. The removal mechanism is isotopically selective and causes a shift in specific features of molecular composition, consistent with microbe-mediated oxidation. We suggest organic molecules with an average radiocarbon age of 3,200 years are bioavailable to crustal microbes, and that this removal mechanism may account for at least 5% of the global loss of DOC in the deep ocean. Cool crustal circulation probably contributes to maintaining the deep ocean as a reservoir of 'aged' and refractory DOC by discharging the surviving organic carbon constituents that are molecularly degraded and depleted in C-14 and C-13 into the deep ocean. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000431168900015 |
WOS关键词 | WESTERN FLANK ; FLUID-FLOW ; CARBON ; HEAT ; EXTRACTION ; COMMUNITY ; SEAWATER ; DISTINCT ; RIDGE ; COLD |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/34911 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Harvard Univ, Dept Organism & Evolutionary Biol, Cambridge, MA 02138 USA; 2.Harvard Univ, Dept Earth & Planetary Sci, 20 Oxford St, Cambridge, MA 02138 USA; 3.Carl von Ossietzky Univ Oldenburg, Inst Chem & Biol Marine Environm ICBM, Oldenburg, Germany; 4.Univ Calif Santa Cruz, Earth & Planetary Sci Dept, Santa Cruz, CA 95064 USA; 5.Woods Hole Oceanog Inst, Marine Chem & Geochem, Woods Hole, MA 02543 USA; 6.Univ Delaware, Coll Earth Ocean & Environm, Sch Marine Sci & Policy, Lewes, MA 19716 USA; 7.Res Council Norway, Oslo, Norway |
推荐引用方式 GB/T 7714 | Walter, Sunita R. Shah,Jaekel, Ulrike,Osterholz, Helena,et al. Microbial decomposition of marine dissolved organic matter in cool oceanic crust[J]. NATURE GEOSCIENCE,2018,11(5):334-+. |
APA | Walter, Sunita R. Shah.,Jaekel, Ulrike.,Osterholz, Helena.,Fisher, Andrew T..,Huber, Julie A..,...&Girguis, Peter R..(2018).Microbial decomposition of marine dissolved organic matter in cool oceanic crust.NATURE GEOSCIENCE,11(5),334-+. |
MLA | Walter, Sunita R. Shah,et al."Microbial decomposition of marine dissolved organic matter in cool oceanic crust".NATURE GEOSCIENCE 11.5(2018):334-+. |
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